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Page 27-1
Chapter 27
The Equation Library
The Equation Library is a collection of equations and commands that enable
you to solve simple science and engineering problems. The library consists of
more than 300 equations grouped into 15 technical subjects containing more
than 100 problem titles. Each problem title contains one or more equations that
help you solve that type of problem. Appendix M contains a table of the groups
and problem titles available in the Equation Library.
Note: the examples in this chapter assume that the operating mode is RPN and
that flag –117 is set. (Flag –117 should be set whenever you use the numeric
solver to solve equations in the equations library.)
WARNING: You can delete the Equation Library if you need more room on
your calculator. Libraries 226 and 227 in port 2 constitute the Equation Library,
and they can be deleted just like any user-created library. However, if you are
thinking of deleting these libraries but there is some likelihood that you will
need to use the Equation Library in the future, you should copy them to a PC,
using the HP 48/49 Calculator Connectivity Kit, before deleting them on the
calculator. You will then be able to re-install the libraries later when you need to
use the Equation Library. (Deleting a library is explained in chapter 26.)
Solving a Problem with the Equation Library
Follow these steps for solving an equation using the Equation Library.
1. Press G—` EQLIB EQNLI to start the Equation Library.
2. Set the unit options you want by pressing the ##SI##, #ENGL#, and UNITS menu
keys.
3. Highlight the subject you want (for example, Fluids) and press `.
4. Highlight the title you want (for example, Pressure at Depth) and press `.
5. The first equation is displayed. Press #NXEQ# to display subsequent equations.
6. Press #SOLV# to start the Solver.